Select the events that occur in the interphase stage of cell-cycle .
(a) RNA and protein synthesis.
(b) Cytoplasmic growth.
(c) Synthesis of spindle fibres protein.
(d) Disappearance of Golgi body and ER.

Options

A. a and d only
B. a , b and c only
C. b, c and d only
D. c and d only

Answer

To solve the question regarding the events that occur during the interphase stage of the cell cycle, we will analyze each option provided:

1. **Understanding Interphase**: Interphase is the phase of the cell cycle where the cell prepares for division. It consists of three sub-phases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2). During interphase, the cell grows, synthesizes RNA and proteins, and replicates its DNA.

2. **Analyzing Each Option**:
- **(a) RNA and protein synthesis**: This occurs during the G2 phase of interphase. The cell synthesizes the proteins and RNA necessary for mitosis. **(This option is correct.)**
- **(b) Cytoplasmic growth**: This is a key event during the G1 and G2 phases of interphase, where the cell increases in size and prepares for division. **(This option is correct.)**
- **(c) Synthesis of spindle fibers protein**: This occurs during the G2 phase as the cell prepares for mitosis. Spindle fibers are essential for chromosome separation during cell division. **(This option is correct.)**
- **(d) Disappearance of Golgi body and ER**: This event does not occur during interphase. The Golgi apparatus and endoplasmic reticulum (ER) do not disappear during interphase; rather, they may undergo changes during mitosis. **(This option is incorrect.)**

3. **Conclusion**: The events that occur during interphase are (a) RNA and protein synthesis, (b) cytoplasmic growth, and (c) synthesis of spindle fibers protein. The only option that does not occur during interphase is (d) disappearance of Golgi body and ER.

### Final Answer:
The correct events that occur in the interphase stage of the cell cycle are:
- (a) RNA and protein synthesis
- (b) Cytoplasmic growth
- (c) Synthesis of spindle fibers protein